Аннотация:A method of step atom photoionization in acetilene-air flame is suggested for indium determination. The limit of detection is 0.03 mg/ml and can be reduced significantly by using a more sensitive recording system and a high-light laser as excitation source. 1000-times indium amounts of Pb, Sn, Te, Cd do not interfere. The method can be used for determining 0.029% of indium in Pb-Sn-Te semiconductor alloys.